Experimental study and control strategy of wind-driven DFIG and solar PV for sustainable power generation

This paper presents a hybrid wind–solar energy system integrating A Doubly-Fed Induction Generator (DFIG) with solar Photovoltaic (PV) modules through a boost converter–battery–inverter interface. A closed-loop control strategy, implemented on a Field Programmable Gate Array (FPGA) (Altium Nanoboard 3000), ensures stable stator voltage and frequency for isolated load operation. Reactive power compensation is achieved via a 2 kVAR capacitor at the stator side. The solar PV subsystem features a current-sensor-based Maximum Power Point Tracking (MPPT) algorithm using the Converter Output Current Based (COCB) method, which operates independently of panel parameters and switches to constant voltage mode when the battery is fully charged. Hardware tests with a solar simulator and real panels confirm improved tracking accuracy and reduced oscillations over conventional approaches. Experimental validation confirms the system’s reliability and adaptability under varying conditions, highlighting its potential for efficient energy management in standalone applications. Results verified its effectiveness, achieving a Total Harmonic Distortion (THD) below 3% and exhibiting rapid dynamic performance.